- Ice Cream & Frozen Desserts, Catonsville
- Ice Cream & Frozen Yogurt, Catonsville
- Imported Auto Parts, Catonsville
- In Home Services, Catonsville
- Indian Restaurants, Catonsville
- Individual & Family Information & Referral Services, Catonsville
- Industrial & Commercial Cleaning Services & Companies, Catonsville
- Industrial & Commercial Real Estate, Catonsville
- Industrial & Heavy Equipment Repair & Service, Catonsville
- Industrial & Heavy Equipment Vehicle Rental & Leasing, Catonsville
- Industrial Contractors, Catonsville
- Industrial Equipment & Machinery, Catonsville
- Industrial Goods & Products - Hard Goods - Small, Catonsville
- Industrial Goods & Products - Soft - Large & Small, Catonsville
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Catonsville
- Industrial Pump Repair & Service, Catonsville - Centrifugal, Positive Displacement, Submersible, Diaphragm, Hydraulic, Water, Vacuum Pumps, etc
- Industry, Catonsville
- Information Brokers, Catonsville
- Information Consultants, Catonsville
- Information Retrieval Services, Catonsville
- Inspection & Testing Services, Catonsville
- Insurance Carriers, Catonsville
- Insurance Carriers By Specialty, Catonsville
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- Insurance Claim Processing Services, Catonsville
- Insurance Consulting & Information Services, Catonsville
- Insurance Farm, Catonsville
- Insurance General Liability, Catonsville
- Insurance Major Medical, Catonsville
- Insurance Motorcycles, Catonsville
- Insurance Real Property, Catonsville
- Insurance Renters, Catonsville
- Insurance Services, Catonsville
- Interior Designers, Catonsville
- Interior Designers & Decorators, Catonsville
- Internal Medicine Doctors, Catonsville - Internists Physicians & Surgeons
- International Restaurants, Catonsville
- Internet Development, Catonsville
- Internet Entertainment, Catonsville - Internet Services
- Internet Home Page Development & Consulting, Catonsville
- Internet Products - Hardware & Software Providers, Catonsville
- Internet Providers, Catonsville
- Internet Services, Catonsville
- Internet Websites, Catonsville - Web Hosting, etc
- Investment Management Services, Catonsville
- Investment Services & Advisors, Catonsville
- Italian Restaurants, Catonsville
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